Measuring device and method for measuring average particulate size and concentration of atmospheric particulates

Abstract

The invention discloses an atmospheric environmental-friendly optical detecting instrument, and particularly discloses measurement of the average particulate size of atmospheric inhalable particulates and detection of particulate concentration. A multi-wavelength output optical maser sends out laser with certain wavelength under the drive of a DSP (Digital Signal Processing) control module; the laser passes through a single mode fiber, is coupled by an optical fiber coupler, enters a multi-optical path sample cell through an incidence hole, interacts with gas to be measured, mainly has scattering and absorbing effects with the gas to be measured, is reflected for several times in the sample cell, and then is ejected out of the sample cell through the incidence hole; the scattered and absorbed gas enters a photoelectric detector through a laser signal ejected out of the sample cell through the incidence hole, and is converted into a weak electrical signal; the electrical signal is conditioned by a signal conditioning circuit and is input into an A / D conversion module of a high-speed DSP controller; the average particulate size and concentration are calculated under the control of a calculation procedure, and are displayed on an LCD (Liquid Crystal Display) module; in addition, the electrical signal can also be transmitted to a remote monitoring device through a wireless communication module.

Description

technical field [0001] The invention relates to an atmospheric environment-friendly optical detection instrument, in particular to a measurement of the average particle diameter and particle concentration detection of atmospheric inhalable particles. Background technique [0002] With the development of industrialization, the increase of automobiles, the rapid growth of population, and the intensive development of real estate, the air quality in cities has declined sharply, and one of the most significant indicators is the increase of inhalable particulate matter in the air. Inhalable particulate matter mainly refers to particles with a diameter of less than 10 μm in the atmosphere, generally referred to as PM10. They can directly enter the respiratory tract of the human body during breathing and accumulate in the lungs. Long-term inhalation by the human body can cause various respiratory diseases such as pneumonia, asthma, and decreased lung function. Moreover, it lasts fo...

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Problems solved by technology

The common scattering extinction method is used to measure the average particle size of particles, and the three-wavelength extinction method is used to measure the particle size and distribution of particles. According to the literature ("Journal of Instrumentation", 21 (2) 208-210, 2000), the laser passes through the sample pool once The extinction effect generated by the interaction with the particles reverses the particle size and concentration distribution. This method has the advantages of non-intervention, no secondary pollution and no poisoning, but the general sample cell is short and sensitive when measuring low-concentration particles. lower

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